Oil-fuel heater



L. A. PFEIFFER. `0H. FUEL HEATER. APPLICATION man FEB. 11.1920.

Patented Dec. 13,

Fysio E/ 4 l 1N V EN TOR L oz//s ,4. Pff/FFH? BY A TTORNE Y UNITED STATE-s PATENT OFFICE.

LOUIS e. PFEIFFER, or SAN FnANCIsCo, CALIFORNIA.

OIL-FUEL HEATER.

Specification of Letters Patent.

Patented Dec. 1 3, 192,1'.

Application led February 11, 1920. Serial No. 357,880.

'ing steam or water. The invention includes the construction and arrangement of parts' whereby any leakage at joints must occur outside of the apparatus instead of interiorly as often occurs in present practice.

In this specification and the annexed drawings the invention is illustrated in the form considered to be the best, but it is to be understood -that the invention is not limited to such form, because it may be embodied in `other forms, and it is also tobe understood that in and by the claims following the specification it is desired to cover the invention lin whatever form it may be embodied.

In the accompanying one sheet of drawings Figure 1 is a vertical section of a heater constructed in accordance with my invention.

Fig. 2 is a detail view of the strainer plug for admitting oil to my heater.

In detail, the construction illustrated in the drawings includes a cylindrical oil chamber comprising the walls 1, closed at the top and bottom by the heads 2 and 3, preferably concavo-conveX for greater strength and integrally welded at their peripheral points of contact with the wall l, to form a pressure tight oil drum. The head 2 is provided with a central spud to receive the threaded nipple l through which the oil is introduced to the drum chamber. AThe bottom 3 of the drum is provided with a nipple 5 and the blow-off pipe 5f to provide means for introducing steam under pressure to the interior of the chamber for the purposes of cleaning. Concentrically with the walls of the-drum 1, I arrange the central stay tube 6 welded to the bottom 8 and the head 2 before they are introduced into the drum cylinder. The incoming oil is introduced -into an integral whole.

through this stay tube E to the bottom ofthe drum, escaping through the notches' formed inthe edges ofthe lower end of the tube. All of the welding herein referred -to isv at presentaccomplished'by the use of :the loxy- -acetylene flame, but it maybe accomplished by brazing or otherwise with the objectof forming the vheater and its assembled parts The drum l is surrounded by a steam jacket formed by the cylindrical wall 8, having its upper and lower edges flanged .in as at 9 vand 10 to approximate contact with the outer surfaces of the drum 1 to .which it is welded as described, to form a ressure tight jacket 8 concentric with thedium 1. Surrounding this steam jacket -is a concentric oil space, formed by the wall 11 having its ends 12 and 13 similarly flanged in and welded to 'the wall 8 to form a pressure tightoil jacket 1l surrounding the aforesaid steam space. A further steam jacket 14: is `superimposed over the oil jacket by the wall 14 flanged in at 15 and 16 and joined to the wall 11 by welding as previously described. These 'superimposed concentric Walls are preferably made in graduated height to facilitate assembling and welding as illustrated `in the drawing, contributing also to the symmetry and good appearance of the structure. The heater rests upon the feet 17-17 suitably welded to the outer surface of the heater. Similar angular supports 18-18 are provided at the top of the heater to receive pumps or other machinery to be assembled therewith.

The elbow 19 establishes communication between the oil drum and the oil jacket to which its respective ends are welded. Oil is delivered from the oil jacket through the nipple 2O screwed thereinto. Steam is introduced into the inner and outer steam jackets through the inlets 21 and 22 respectively circulating therethrough and escaping, alongwith its condensation, to the outlet 23, communicating with the bottom of both jackets.

The oil is caused to take a serpentine path around and through the oil space 11 between the walls 8 and 11 because of the fact that the shell 1l is formed with spiral corrugations 29 which contact with the shell 8 which is also spirally corrugated throughout its length. The shell 14 is also corrugated and all welded at their points of contact one with the other. This forms a spiral channel between the jackets causing the oil and steam to circulate around and around between the jackets before reaching the exits, in this manner preventing the oil taking a short circuit from the elbow 19 to the outlet 20, retaining it longer in the jacket and consequently raising its temperature to a higher degree.

By constructing the shell with spiral corrugations, a lighter material may be used, and at the same time a very rigid structure produced. The spiral corrugations also allow for a certain amount of expansion due to heat without injury to the device. rlhese corrugations also form convenient means for welding one shell to another thereby producing spiral passages between.

It will be noted that the oil enters the vheating chamber 1l at the bottom and through the supply pipe 3l into the passageV 32 in the plug`33, passes through the strainer 34-into the outlet passage 35 of the strainer.

The plug 33 is operated by the handle 36 in the usual manner. From the passage' 35 the oil flows through the pipe 37, through the nipple 4L and into the tube 6 in the oil drum, from which it passes as previously described. lVhen the handle 36 is turned at an angle of 90 degrees from the position` shown, the by-pass 38 connects across the supply pipe 3l to the pipe 37 cutting out the strainer, which may be thoroughly cleaned by admitting steam into the chamber 35 blowing off the accumulations'i'rom the interior of the strainer 34 which drain oli1 through the cock 39.

Having thus described this invention what l claim as new and desire to secure by Letters Patent of the United States is as 'follows:

l. A heater including a drum, a plurality or" spaced walls surrounding 'said drum and j oinedthereto and to each other at the ends thereof, each of said walls being provided with spirally projecting shoulders thereon, so' that the shoulders ot the first wall ad.- jacent the drum will contact therewith to form a spiral passage and the shoulders of theiremaining walls contact with the next adjacent walls, intermediate the shoulders thereof, to form spiral passages.` i

2. A heater including a drum, a series of inlet, au annular wall surrounding saidl drum and havin@` its edges welded thereto, an annular wall surrounding said annular wall and having its edges welded thereto to form an oil jacket, having an outlet and a passage connected with said drum.

6. A heater including a drum, a wall surrounding said drum and joined thereto, Y

a second wall surrounding said rst mentioned wall and joined thereto, and a spiral corrugation formed in each of said walls.

7. A heater including a drum having an oil inlet, a steam jacket formed by a spirally corrugated wall surrounding and joined to said drum, an oil jacket formed by a spirally corrugated wall surrounding and joined to the Vwall ot said steam jacket, and connected with said drum and having an outlet. a second steam jacket formed bya spirally corrugated wall .surrounding and joined to the wall of said oiljacket, and

means `tor passing steam through said steam jackets.

8. A heater including a drum having an oil inlet, a steam jacket formed by a spirallyA corrugated wall surrounding and joined t0 said drum, an oil jacket formed by a spirally corrugated wall surrounding and joined to the wall of said steam jacket, and connected with said drum and having an outlet, a second steam jacket formed by a spirally corrugated walll surrounding andjoined to the wall of said oil jacket, andmeans for passing fluid through said jackets.

9. A heater including a drum having a central tube extending throughout its length and having lateral openings adjacent to the end of said drum, and an inlet to said drum within said tube, a steam jacket vformed by a spirally corrugated wall surrounding and joined to said drum, an oil jacket formed by a spirally corrugated wall surrounding and joined to the wall ot said steam jacket, and connected with said drum and having an outlet; a. second steam jacket formed by a spirally corrugated wall surrounding Aand joined to the wall of said oil jacket; and means 'for passing steam through said steam jackets. Y i

10. A heater including a drum having an oil inlet; a steam jacket formed by a Wall surrounding and joined to said drum, an oil jacket formed by a Wall surrounding and joined to the Wall of said steam jacket, and connected With said drum and having an outlet; a. second steam jacket formed by a Wall surrounding and joined to the Wall of said oil jacket; and means for causing steam and oil to circulate spirally through their respective jackets in opposite directions to each other.

il. A heater including a drum, a plurality of spaced Walls surrounding said drum and joined thereto and to each other at the ends thereof, each of said Walls being provided with spirally projecting shoulders thereon so thatthe shoulders of one Wall contact with the next adjacent wall intermediate its shoulders.

l2. A heater including` a drum, a Wall surrounding said drum and joined thereto at its ends; a plurality of'spaced Walls surrounding said iirst mentioned Wall, each of said Walls being joined to each other at their ends and spiral shoulders formed in each of said Walls contacting with the adjacent surrounded Wall to form a plurality of spiral passages.

13. A heater including a drum having an oil inlet; a steam jacket, formed by a Wall having spirally projecting shoulders thereon,surrounding and joined to said drum; an oil jacket, formed by a wall having spirally projecting shoulders thereon, surrounding and joined to the Wall of said steam jacket and connected with said drum and having an outlet and a second steam jacket, formed by a Wall having Spirally projecting shoulders thereon, surrounding and joined to the Wall of said oil jacket and means for passing steam through said jackets.

In testimony whereof, I have hereunto set my hand at San Francisco, Cal., this 31st day of January, 1920.

LOUIS A. PFEIFFER. 

